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6x40mm
Dec 6, 2012 5:09:22 GMT -8
Post by gunmutt on Dec 6, 2012 5:09:22 GMT -8
Actually I leave predators where the are. I simply kill it and that is all I care about. Big whitetail deer is all I am after. So maybe the 6.5 is where I need to be or wait on the 7ARk
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6x40mm
Dec 6, 2012 9:25:09 GMT -8
Post by GLSHOOTER on Dec 6, 2012 9:25:09 GMT -8
Actually I leave predators where the are. I simply kill it and that is all I care about. Big whitetail deer is all I am after. So maybe the 6.5 is where I need to be or wait on the 7ARk I would go 6.5 in a heat beat. A 7 ARK doesn't look close on the horizon at BHW as far as I can tell. Greg PS: Now if you ordered up a reamer from Dave Kiff at PTG there might be one!!
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6x40mm
Dec 6, 2012 16:59:03 GMT -8
Post by gunmutt on Dec 6, 2012 16:59:03 GMT -8
Talked with the Kurt Buchert on AR15.com. He is currently waiting on a reamer and dies and will be producing 25 barrels for more testing.
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6x40mm
Dec 6, 2012 17:11:29 GMT -8
Post by GLSHOOTER on Dec 6, 2012 17:11:29 GMT -8
Talked with the Kurt Buchert on AR15.com. He is currently waiting on a reamer and dies and will be producing 25 barrels for more testing. An ARK? Greg
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6x40mm
Dec 6, 2012 17:18:22 GMT -8
Post by gunmutt on Dec 6, 2012 17:18:22 GMT -8
Guess its in close relation to the AK due to the grendel case being based on the 7.62x39
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6x40mm
Dec 6, 2012 17:20:31 GMT -8
Post by GLSHOOTER on Dec 6, 2012 17:20:31 GMT -8
Guess its in close relation to the AK due to the grendel case being based on the 7.62x39 THe 7 MM Rocket comes to mind from the old IHMSA days. Greg
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6x40mm
Dec 6, 2012 18:48:34 GMT -8
Post by biggdawg on Dec 6, 2012 18:48:34 GMT -8
here is kurts pic of the 7mm ark
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6x40mm
Dec 17, 2012 4:56:30 GMT -8
Post by helotaxi on Dec 17, 2012 4:56:30 GMT -8
The other thing that the .243 version gives you over the 6.5 is velocity. Out to intermediate ranges the additional velocity of the .243 will overcome the small deficit in bullet BC. It's no different than the comparison between the .243 Win and the .260 Rem. Unless you need the extra bullet mass, the .243 is a better long range round. The available bullet BC's are really very close and the .243 has a significant advantage in velocity. As Greg mentioned, the .243 cal has a much wider selection of bullets as well from the nice and cheap like the 58gn ZMax to the various 100gn+ low drag designs and everything in between. .243 bullets are also less expensive.
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6x40mm
Dec 17, 2012 5:01:39 GMT -8
Post by helotaxi on Dec 17, 2012 5:01:39 GMT -8
Guess its in close relation to the AK due to the grendel case being based on the 7.62x39 I'm not familiar with the specifics of the round but I'm guessing the name is 7mm AR Kurz, thus the little "K". Kurz is German for "short" and was the title stuck on the little round from the STG44 that inspired the 7.62x39 and to some degree the 5.56x45. It looks to me like the ARk is going to be limited on bullet weight. The 7mm pills necessarily have a longer ogive than the 6.5s and the ogive length is the limiting factor on most all of these rounds.
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dr69er
Senior Member
Protect the US Consitution & the American Way.
Posts: 222
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6x40mm
Sept 26, 2013 15:00:39 GMT -8
Post by dr69er on Sept 26, 2013 15:00:39 GMT -8
The other thing that the .243 version gives you over the 6.5 is velocity. Out to intermediate ranges the additional velocity of the .243 will overcome the small deficit in bullet BC. It's no different than the comparison between the .243 Win and the .260 Rem. Unless you need the extra bullet mass, the .243 is a better long range round. The available bullet BC's are really very close and the .243 has a significant advantage in velocity. As Greg mentioned, the .243 cal has a much wider selection of bullets as well from the nice and cheap like the 58gn ZMax to the various 100gn+ low drag designs and everything in between. .243 bullets are also less expensive. I would agree there is some velocity gain, but not enough to make a big difference, you will need more powder capacity to make up for the smaller bore area of the 6mm round. There are almost a equal amount of pill availability with both calibers, with the 6mm having a edge in lighter weight pills of course...JMHO.
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Deleted
Deleted Member
Posts: 0
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6x40mm
Sept 26, 2013 16:17:37 GMT -8
Post by Deleted on Sept 26, 2013 16:17:37 GMT -8
The other thing that the .243 version gives you over the 6.5 is velocity. Out to intermediate ranges the additional velocity of the .243 will overcome the small deficit in bullet BC. It's no different than the comparison between the .243 Win and the .260 Rem. Unless you need the extra bullet mass, the .243 is a better long range round. The available bullet BC's are really very close and the .243 has a significant advantage in velocity. As Greg mentioned, the .243 cal has a much wider selection of bullets as well from the nice and cheap like the 58gn ZMax to the various 100gn+ low drag designs and everything in between. .243 bullets are also less expensive. I would agree there is some velocity gain, but not enough to make a big difference, you will need more powder capacity to make up for the smaller bore area of the 6mm round. There are almost a equal amount of pill availability with both calibers, with the 6mm having a edge in lighter weight pills of course...JMHO. If you are trying to compare the 6mm Vs. 6.5mm bullets look at the main stream weights of both. The 6.5 is so far back in the race it can't even see the 6mm's dust. If you go for the big bullets, the 6mm with a 105 can and does run at 2750-2800 every day. With a BC of over .500 you have to go to a 123 to match it. And we all know the LBC-Grendel can't shoot that fast!!!!!!
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